CybersecurityData BreachCiscoUnified CMSmall Business
Cisco finally confirms attackers exploiting Unified CM flaw
July 1, 2026
Back to all postsCisco has confirmed that hackers are exploiting a critical vulnerability in its Unified Communications Manager (Unified CM), affecting versions 11.5(1) and earlier. The flaw, tracked as CVE-2021-30894, could allow attackers to gain unauthorized access to affected systems. This issue is significant for Canadian businesses because it impacts a widely used communication platform in many SMBs, potentially exposing sensitive data such as voicemails and call logs. To mitigate this risk, Cisco recommends updating to Unified CM version 12.5(4) or later, implementing firewall rules to block malicious traffic, and regularly monitoring network activity for signs of intrusion.
Source: BleepingComputer
CybersecurityData BreachCiscoUnified CMSmall Business
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